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COMBINATORICS
2006
15 years 6 months ago
2006
We prove that n+h 4 vertex guards are always sufficient to see the entire interior of an n-vertex orthogonal polygon P with an arbitrary number h of holes provided that there exis...
182
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DM
2006
15 years 6 months ago
2006
A directed star forest is a forest all of whose components are stars with arcs emanating from the center to the leaves. The acircuitic directed star arboricity of an oriented grap...
162
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CE
2007
15 years 6 months ago
2007
Presenting material in a more object-oriented way is a growing trend in Computer Science education. er takes the idea of objects-first or abstraction-first teaching a step further...
173
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CN
2007
15 years 6 months ago
2007
Since the turn of the century, smart card technology has pushed its borders both on the high end to integrate new functionalities (e.g., networking) and on the low end to adapt to...
163
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IPL
2008
15 years 6 months ago
2008
Generalized Petersen (GP) networks and periodically regular chordal (PRC) rings have been proposed independently to ameliorate the high latency and extreme fragility of simple rin...